ASVAB Mechanical Comprehension Practice Test 935255 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.30
Score	0%	66%

Review

1 A = 5 ft., the green box weighs 25 lbs., and the blue box weighs 40 lbs. What does distance B need to be for this lever to balance?

65% Answer Correctly

	200 ft.
	1.56 ft.
	6.25 ft.
	3.13 ft.

Solution

In order for this lever to balance, the torque acting on side A must equal the torque acting on side B. Torque is weight x distance from the fulcrum which means that the following must be true for the lever to balance:

f_Ad_A = f_Bd_B

For this problem, the equation becomes:

25 lbs. x 5 ft. = 40 lbs. x d_B

d_B = \( \frac{25 \times 5 ft⋅lb}{40 lbs.} \) = \( \frac{125 ft⋅lb}{40 lbs.} \) = 3.13 ft.

Coplanar forces:

61% Answer Correctly

	act in a common plane
	act along the same line of action
	have opposite dimensions
	pass through a common point

Solution

Collinear forces act along the same line of action, concurrent forces pass through a common point and coplanar forces act in a common plane.

3 How much work can a 2 hp engine do in 8 seconds?

52% Answer Correctly

	8800 ft⋅lb
	4 ft⋅lb
	1 ft⋅lb
	8 ft⋅lb

Solution

Horsepower (hp) is a common measure of power output for complex machines. By definition, a 1 hp machine does 550 ft⋅lb of work in 1 second: 1 hp = 550 ft⋅lb/s. Substituting the variables for this problem gives us:
\( W = 2 hp \times 550 \frac{ft⋅lb}{s} \times 8s = 8800 ft⋅lb \)

Potential energy is energy that has the potential to be converted into what?

80% Answer Correctly

	power
	work
	kinetic energy
	heat

Solution

Potential energy is the energy of an object by virtue of its position relative to other objects. It is energy that has the potential to be converted into kinetic energy.

Collinear forces:

72% Answer Correctly

	act in a common plane
	pass through a common point
	are unrelated to each other
	act along the same line of action

Solution

Collinear forces act along the same line of action, concurrent forces pass through a common point and coplanar forces act in a common plane.